Nexavar, known generically as sorafenib, is a medication primarily used in the treatment of certain types of cancers. It is classified as a tyrosine kinase inhibitor, a type of drug that works by blocking the action of enzymes known as tyrosine kinases, which are involved in the signaling pathways that regulate cell division and growth. By inhibiting these enzymes, Nexavar can help slow down the growth and spread of cancer cells. It is most commonly prescribed for the treatment of advanced renal cell carcinoma (a type of kidney cancer), hepatocellular carcinoma (the most common form of liver cancer), and thyroid carcinoma when conventional treatments have failed. Nexavar is taken orally, and its use can be associated with a range of side effects, which necessitates close monitoring by healthcare professionals.